Plan B After 72 Hours
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Plan B After 72 Hours
How long do you have to take Plan B?
Plan B helps prevent pregnancy before it starts by temporarily delaying ovulation when taken within 72 hours (3 days) after unprotected sex. Wondering whether youâre within the window to take Plan B? Enter the date and time you had unprotected sex below.
Find Plan B yourself in the family planning aisle at major retailers like CVS, Walgreens, Target, Walmart, and more.
Plan B OneâStep is a registered trademark of Foundation Consumer Healthcare.
© 2022 Foundation Consumer Healthcare. This site is intended for US audiences only.
This and other links to websites that are not under the control of Foundation Consumer Healthcare LLC (âFoundationâ) are provided for convenience of reference only and are not intended as an endorsement by Foundation of the organization or a warranty of any type regarding the information on the website. Foundation does not and cannot review all communications and materials posted or uploaded to other websites and is not responsible for the content of these communications and materials.
Remember: Plan B must be taken within 72 hours of unprotected sex. If you need it right away, find a store near you .
Plan B is available for same day delivery, curbside pickup, and standard shipping via major retailers.
WHEN PLAN A DOESNâT WORK OUT, thereâs Plan B
Shop for Plan B your way: on-shelf in the family planning aisle or buy online and pick up in-store or curbside.
Plan B, sometimes referred to as the âmorning after pill,â is emergency contraception you take within 72 hours after unprotected sex. The sooner you take it, the better it works.
Plan B OneâStep is a registered trademark of Foundation Consumer Healthcare.
© 2022 Foundation Consumer Healthcare. This site is intended for US audiences only.
This and other links to websites that are not under the control of Foundation Consumer Healthcare LLC (âFoundationâ) are provided for convenience of reference only and are not intended as an endorsement by Foundation of the organization or a warranty of any type regarding the information on the website. Foundation does not and cannot review all communications and materials posted or uploaded to other websites and is not responsible for the content of these communications and materials.
Remember: Plan B must be taken within 72 hours of unprotected sex. If you need it right away, find a store near you .
Plan B is available for same day delivery, curbside pickup, and standard shipping via major retailers.
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How effective is Plan B and how late can you take it?
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Medically reviewed by Sally Chao, MD . Last updated on July 30, 2021.
Plan B ( levonorgestrel ) is estimated to be 60% to 94% effective at preventing pregnancy when taken within 3 days (72 hours) after unprotected sex. Somewhere between 0.6% to 2.6% of women who take Plan B within this time frame will still become pregnant.
While Plan B can be taken up to 72 hours after unprotected sex, its efficacy decreases with time, and it is best to take it as soon as possible. For example, the chances of pregnancy are higher if Plan B is taken 4 days after unprotected sex, but are subsequently lowered if taken 3 days, 2 days, 1 day or within 24 hours after unprotected sex. However, the American College of Obstetricians and Gynecologists notes that some studies suggest that it can be moderately effective at preventing pregnancy up to 5 days after unprotected sex. Five days after unprotected sex is the latest time with which Plan B has been shown to lower your chances of pregnancy.
The efficacy of Plan B is also affected by the time at which it is taken within your menstrual or reproductive cycle. Plan B works best when taken before ovulation, or when an ovary releases an egg. Once there is a surge in the hormone that initiates ovulation and ovulation begins, Plan B cannot prevent pregnancy. Its primary mechanism of action is to change hormone levels such that ovulation is delayed. This is why it is important to take Plan B as soon as possible after unprotected sex. As treatment is delayed, ovulation becomes more imminent (if it has not yet occurred).
A review of studies in Clinical Obstetrics and Gynecology showed that among 492 women who took Plan B after unprotected sex, those who took it on or after the day of ovulation had the same pregnancy rate as would be expected among women who used no contraception at all. By comparison, none of the women who took Plan B before ovulation became pregnant.
In the event of another unprotected sexual encounter after Plan B is taken, Plan B will not protect against pregnancyâyou will need to take Plan B again after another unprotected sexual encounter.
Plan B may also be less effective at preventing pregnancy in women who are overweight or obese. Studies reviewed by Cochrane suggest that the dose of levonorgestrel in Plan B has a lowered potency when taken by women who have a higher body mass index.
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Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Data sources include IBM Watson Micromedex (updated 5 July 2022), Cerner Multumâą (updated 27 June 2022), ASHP (updated 16 May 2022) and others.
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